Question

the inner cirumfrence of a circular track is 176 m.the track is 7 m wide. calculate the
a. area of the track.
b. cost of putting up a fence along the outer circle at the rate of rs 12 per metre.​

Answer 1

Answer:

circumference of track=2×22/7×r

176=2×22/7×r

r=(176×7)/2×22

=28m

radius of outer circle=28+7

=35m

area of track=area of outer circle-area of inner circle

=22/7×r^2-22/7×r^2

=22/7×35×35-22/7×28×28

=3850-2464

=1386m^2

circumference of outer circle =2×22/7×35

=220m

cost of putting fence=220×12

=2640rupees

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